EP 0322357 B1 19930818 - PROCESS FOR THE PREPARATION OF POLYAZO DYES
Title (en)
PROCESS FOR THE PREPARATION OF POLYAZO DYES
Publication
Application
Priority
CH 492387 A 19871216
Abstract (en)
[origin: US4996302A] A process for the preparation of polyazo dyes is described which comprises (a) diazotizing a compound of the formula <IMAGE> (1) and coupling the product onto a compound of the formula <IMAGE> (2) (b) diazotizing a compound of the formula <IMAGE> (3) and coupling the product onto the product obtained according to (a); (c) diazotizing a compound of the formula <IMAGE> (4) and coupling the product onto the product obtained according to (b); (d) if desired, coupling of a further diazotized compound of the formula (3) onto the product obtained according to (c); and (e) if desired, metallizing the product obtained according to (c) or (d); and in which the symbols are as defined in claim 1. The polyazo dyes obtainable by the process are suitable for dyeing a wide range of textile and non-textile materials and, in particular, for dyeing leather.
IPC 1-7
IPC 8 full level
C09B 33/24 (2006.01); C09B 33/30 (2006.01)
CPC (source: EP US)
C09B 33/24 (2013.01 - EP US); C09B 33/30 (2013.01 - EP US)
Designated contracting state (EPC)
BE CH DE ES FR GB LI
DOCDB simple family (publication)
EP 0322357 A2 19890628; EP 0322357 A3 19891108; EP 0322357 B1 19930818; BR 8806642 A 19890829; DE 3842268 A1 19890629; DE 3842268 C2 19901018; DE 3883361 D1 19930923; ES 2058334 T3 19941101; US 4996302 A 19910226
DOCDB simple family (application)
EP 88810843 A 19881207; BR 8806642 A 19881215; DE 3842268 A 19881215; DE 3883361 T 19881207; ES 88810843 T 19881207; US 28080288 A 19881207